I have a 93 ranger with a 4.0L V6 manual tran. Does anyone know where the slave cylinder is located or why I have trouble putting it in to gear.

The slave cylinder is located between the tranny and engineblock. Its what disengages the clutch so you can shift gears. Rangers are prone to slave cylinder failure. About 2 days after i got my truck, mine went out but the car lot switched it out for a new one for free. It takes alot of work to switch them out because you have to take the tranny out to get to it. I recommend you call around some transmission places and get some quotes.